Dont allow edit or remove of system notes

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/projects/notes_controller.rb

@@ -30,8 +30,10 @@ class Projects::NotesController < Projects::ApplicationController
   end
 
   def update
-    note.update_attributes(note_params)
-    note.reset_events_cache
+    if note.editable?
+      note.update_attributes(note_params)
+      note.reset_events_cache
+    end
 
     respond_to do |format|
       format.json { render_note_json(note) }
@@ -40,8 +42,10 @@ class Projects::NotesController < Projects::ApplicationController
   end
 
   def destroy
-    note.destroy
-    note.reset_events_cache
+    if note.editable?
+      note.destroy
+      note.reset_events_cache
+    end
 
     respond_to do |format|
       format.js { render nothing: true }

app/models/note.rb

@@ -337,4 +337,8 @@ class Note < ActiveRecord::Base
   def set_references
     notice_added_references(project, author)
   end
+
+  def editable?
+    !system
+  end
 end

app/views/projects/notes/_note.html.haml

@@ -9,7 +9,7 @@
             %i.icon-link
             Link here
            
-          - if(note.author_id == current_user.try(:id)) || can?(current_user, :admin_note, @project)
+          - if can?(current_user, :admin_note, note) && note.editable?
             = link_to "#", title: "Edit comment", class: "js-note-edit" do
               %i.icon-edit
               Edit